The gas glows, and we call this an emission nebula.

体会光，我们称之为云。

The orion nebula is a special kind of nebula called a stellar nursery.

猎户座云是一种特殊云，叫做恒摇篮。

Orion's sword is home to the great orion nebula, a cloud of dust, hydrogen, helium, and other gases.

猎户剑位置有猎户座云，是一种由尘埃、氢、氦及其他体组成云。

He saw clusters of stars, brightly colored nebulas, even entire galaxies!

他看到了无数团，明亮云，甚至还看到了整个银河！

However, this nebula started off more or less as a big shapeless blob.

但是一开始这云或多或少更像个不成形水滴。

Everything we find on the Earth today also originated in that nebula.

我们地球上一切也都来源于那片云。

This is an emission nebula located just below Orion's belt.

这是位于猎户座带下方云。

It is a nebula: a star-forming region where new stars are being born.

一个正在诞生新恒恒形成区域。

The color of an emission nebula depends on the gas in it and how hot it is.

云颜色取决于其体和它温度。

Among the other four images were two that showed huge clouds of gas and dust – called nebulas.

在其他四张照片，有两张展示了巨大体和尘埃云——也就是云。

Some nebulae are small and dense, others can be dozens or hundreds of light years across.

一些云小而稠密，另一些云直径则可达数十或数百光年。

Because when we look deep into the nebula, we don't just see individual elements.

因为当我们凝视云时，我们看到并不是单一化学元素。

A typical density in a gas nebula is only a few thousand atoms per cubic centimeter.

体云典型密度只有每立方厘米几千个原子。

The entire nebula is lit by four stars located in its heart, collectively called the Trapezium.

整个云由位于其心四颗恒照亮，统称为梯形。

Really, a nebula is barely more than a vacuum.

实际上，云只不过是一个真空。

Those elements will spread out to become a nebula, a rich chemical cloud drifting through space.

这些物质最后会扩散开来，形成新云，即一大团富含化学物质云团飘逸在宇宙之。

At the centre of the nebula lies the remnant of the star, its core, crushed by the force of gravity.

在云心处，这颗恒核依然存在着，在引力作用下它已是面目全非。

When Pan Gu broke the nebula apart, The dense and pure defined, did clearing start.

当盘古破开云， 稠密分明， 清净始。

The Orion nebula is one of the wonders of the universe.

猎户座云是宇宙奇迹之一。

He discovered that this was not, in fact, a nebula.

他现这实际上不是云。